Doorstop and alarm



l" showing the bolt in its retracted position, y y

7 tact carried bv the door adapted to strike Patented July 5, 1932 UNITED STATES ROBERT TARRANT, 0F CHICAGG, ILLINOIS` DOORSTOP AND ALARM Application led September 8, 1930. Serial No. 480,580.

This invention relates to improvements in door-stops and alarms, and more especially such mechanism adapted for use in connection with swinging doors.

a Among the features of my invention is the provision of such mechanism adapted to take the place of the well-known chain-lock which permits a door to open merely a short distance for conversation purposes and prevents passage of a person therethrough. Such chainlocks are unsatisfactory, difficult to adjust, and frequently not secure. Another feature of my invention is the provision of mechanism which will serve all the purposes of the l-f chain-lock and more. My improved device is not conspicuous, easily operated, and secure.

Another feature of my invention is the provision of a door-stop that can be operated by the foot, thus leaving the hands free for Wl' other uses. I have also provided in connection with the door-stop mechanism for sounding an alarm when the stop is in use.

Other features and advantages of my invention will appear more fully as I proceed i with my specification.

In that form of device embodying the features of my invention shown inthe accompanying drawings:

Figure 1 is a view in side elevation, Fig. 2

"i is a view taken as indicated by the lille 2 of Fig. 1, Fig. 3 is a view taken as indicated by the line 3 of Fig. 1, Fig. 4 is a view on an enlarged scale taken as indicated by the line 4 of 2, Fig. 5 is a view similar to Fig. 4

Fig. 6 is a view in end elevation, and Fig. is a fragmentary bottom pla-n view of the portion of the door-stop under the bolt.

As shown in the drawings, 10 may indicate l a fioor, 11, the usual threshold, and 12, a

swinging door hinged at 13.

The stop-mechanism includes a stop housing 14 adapted to be countersunk in the floor and provided with a floor plate 15. Numeral i 16 indicates a vertically movable bolt in the form of a tube or sleeve slidable on the guide post 17 and yieldingly projected or pushed upwardly by the spiral compression spring 18. The bolt 16 is provided with a shoulder 16a adapted to engage the floor plate 15 t0 limit the upward movement of the bolt to the position shown in Fig. 4. A

Releasable means are provided for holding the bolt down or in its retracted position, as shown in F ig. 5. vSuch means include a hori- Zontally movable latch pin 19 yieldingly pressed to the right as viewed in Fig.` 5) by the compression spring 2O.v When this latch is in the position shown in Fig. 5, the end of the pin 19 lies above the shoulder 16a, thus holding the bolt 16 in its retracted position. The latch pin 19 is adapted to be withdrawn by downward pressure ofthe foot of the operator on the floor pin or trigger 21. This pin is slidably mounted in the casing 14 andyieldingly pressed upwardly by a compression spring 22. A connection between the pin 21 and the latch 19 is yeffected by means of the'bell-cranlr 23 pivoted at 24, said bellcrank being provided with a ball 25 on its lower arm lying in a suitable socket 26 inv the pin 21. The upper end of the other armv n of the bell-crank is pivotally connected to latch pin 19, as indicated by 27.

It will be seen that downward pressure of the pedal or trigger 21 by means of the foot will retract the latch pin 19, thus releasing its innerend from the shoulder 16a, permitthe ting the spring 18 to project the bolt 16 upwardly into locking positionwhere it will be engaged by the door to prevent opening of the same.

I also provide mechanism for operating an alarm when the bolt 16 is in operative position. Such mechanism includes a con- 33. The electric circuit also includes a wire n 34 leading from the alarm to a suitable source of electrical energy 35 and another Wire 36 leading from such source to the metal casing 14 of the doorstop.

In the operation of the device, if the bolt 16 is up and the door is opened, the pin 29 Will engage the bolt and be forced inwardly until it is pressed against the contact 31, thus completing the electric circuit and 'ringing the alarm 33.

It is to be understood that the door-stop may be suitably located with respect to the door, and its path in order to limit the open ing of the door as desired.

The bolt 16 is released or pressed into inoperative position by merely pressing the same downwardly with the foot until the latch 19 engages the shoulder 16a. This is a great improvement over the old chain-locks which frequently are difficult to release.

It is to be noted that the alarm 33 will not be sounded unless the door is. pressed against the bolt with sufficient force to move the pin 29 inwardly against the resistance of the s ring`30 until it engages the contact l31.

he spring 30 may be madesuliiciently stili so that the alarm will not sound unless undue pressure is exerted against the door.

While I have shown andy described certain embodiments of my invention, it is to be understood that it is capable of many modifications Changes, therefore, in the construction and arrangement may he made without departing from the spirit andscope ofthe invention as disclosed in the appended claims, in which it is my intention to claim all novelty inherent in my invention as broadly as possible, in view of the prior art.

What I regard as new, and desire to secure by Letters Patent, is:

l. Mechanism o the character described including a casing adapted to be countersunk in a floor in the path of movement of a door, said casing having parallel recesses therein open at one end and closed at the other, a bolt slidahly mounted in one of said recesses and ada ted to move from a projected position in t e path of the door to a position retracted out of said path, a trigger slidable in the, other recess, a. latch member Vslidable at a right angle to said bolt and trigger interiorly of the casing and betweenthe bolt and trigger, said bolt having a shoulder, abutment means on the. casing engageable by the shoulder in the projected position of the latter, means to urge projection ofthe bolt, means urging projection of the latch means so as to overlap said shoulder Whenthe. holt is retracted, and a connection whereby they trigger upon de ression will retract the latch lnlelans out o v the path of movement of the 2` Mechanism of the character described according to claim 1 wherein. the latch means comprises a pin, said casing having a space in which the pin operates, a bushing at one end of said space through which the pin slides, a spring urging projection of the pin, surrounding the same and abutting the same and said bushing, a bell crank lever pivoted to the pin and pivoted to the casing, said lever having a free end disposed in a slot in the trigger, and spring means urging projection of the trigger.

3. Mechanism of the character described including a casing adapted to be countersunk in a loor in the path of movement of a door7 said casing having parallel recesses therein open at one end and closed at the other, a bolt slidably mounted in one of said recesses and adapted to move from a projected position in the path of the door to a position retracted out of `said path, a trigger slidable in thc other recess, a latch member slidable at a. right angle. to said holt and trigger interiorly of the casing and between the bolt and the trigger, a single bell-crank lever operatively connected with said trigger and said latch, said bolt having a shoulder, abutment means on the casing engageable by the shoulder in the projected position of the latter, means to urge projection of the bolt, spring means engaging the trigger and urging through said bell-crank lever projection of the latch means so as to overlap said shoulder when the bolt is retracted, said bell-crank serving also to retract the latch from engagement with said shoulder upon depression ot said trigger.

In testimony whereof, I hereunto set my hand this 1th day ot September, 1930.

' ROBERT TAR-RANT. 

